Based on altera DE2 development board USB application process can be achieved with the control of the FPGA, including the input data to the SRAM, the replacement of VGA display pictures, etc.

DE2_USB_API
...........\HW
...........\..\async_receiver.v
...........\..\async_transmitter.v
...........\..\AUDIO_DAC.v
...........\..\CLK_LOCK.v
...........\..\CMD_Decode.v
...........\..\db
...........\..\..\DE2_USB_API.db_info
...........\..\..\DE2_USB_API.eco.cdb
...........\..\..\DE2_USB_API.sld_design_entry.sci
...........\..\DE2_USB_API.asm.rpt
...........\..\DE2_USB_API.done
...........\..\DE2_USB_API.dpf
...........\..\DE2_USB_API.fit.rpt
...........\..\DE2_USB_API.fit.smsg
...........\..\DE2_USB_API.fit.summary
...........\..\DE2_USB_API.flow.rpt
...........\..\DE2_USB_API.map.rpt
...........\..\DE2_USB_API.map.summary
...........\..\DE2_USB_API.pin
...........\..\DE2_USB_API.pof
...........\..\DE2_USB_API.qpf
...........\..\DE2_USB_API.qsf
...........\..\DE2_USB_API.qsf.bak
...........\..\DE2_USB_API.qws
...........\..\DE2_USB_API.sof
...........\..\DE2_USB_API.tan.rpt
...........\..\DE2_USB_API.tan.summary
...........\..\DE2_USB_API.v
...........\..\DE2_USB_API.v.bak
...........\..\DE2_USB_API_assignment_defaults.qdf
...........\..\Flash_Command.h
...........\..\I2C_AV_Config.v
...........\..\I2C_Controller.v
...........\..\Img_DATA.hex
...........\..\LCD_Controller.v
...........\..\Multi_Flash
...........\..\...........\Flash_Command.h
...........\..\...........\Flash_Controller.v
...........\..\...........\Flash_Multiplexer.v
...........\..\...........\Multi_Flash.v
...........\..\Multi_Sdram
...........\..\...........\command.v
...........\..\...........\control_interface.v
...........\..\...........\Multi_Sdram.v
...........\..\...........\Params.v
...........\..\...........\PLL1.v
...........\..\...........\Sdram_Controller.v
...........\..\...........\Sdram_Multiplexer.v
...........\..\...........\Sdram_Params.h
...........\..\...........\sdr_data_path.v
...........\..\Multi_Sram.v
...........\..\prev_cmp_DE2_USB_API.qmsg
...........\..\ps2_keyboard.v
...........\..\Reset_Delay.v
...........\..\RS232_Command.h
...........\..\RS232_Controller.v
...........\..\SEG7_LUT.v
...........\..\SEG7_LUT_8.v
...........\..\SRAM_16Bit_512K.v
...........\..\USB_JTAG.v
...........\..\VGA_Audio_PLL.ppf
...........\..\VGA_Audio_PLL.v
...........\..\VGA_Audio_PLL_wave0.jpg
...........\..\VGA_Audio_PLL_waveforms.html
...........\..\VGA_Controller
...........\..\..............\Img_DATA.hex
...........\..\..............\Img_RAM.v
...........\..\..............\VGA_Controller.v
...........\..\..............\VGA_OSD_RAM.v
...........\..\..............\VGA_Param.h
...........\..\..............\VGA_PLL.v
...........\README.txt
...........\SW
...........\..\DE2_Control_Panel.exe
...........\..\DE2_USB_API.pof
...........\..\DE2_USB_API.sof
...........\..\FTD2XX.DLL
...........\..\Image_Convert_English.pdf
...........\..\ImgConv.exe

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